膨压使水从袋内向外扩散，是增加袋内的水势，这种由于压力而增加的水势称为压力势
3）压力势（pressure potential）：土壤水在饱和状态下，使土壤水所承受的压力不同于参照水面，即以自由水面作为参比标准，这种水势的变化即为压力势。
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当采用双环入渗法和环刀法测定土壤的饱和渗透系数时，土壤剖面土壤水压力势分布规律不同。
The distribution law of pressure potential in saturated soil using two-ring infiltration method to determine the permeability coefficient was different to that using cutting ring method.
地应力变化影响孔隙压力和油势，因而对石油运移和聚集有重要影响。
Change of ground stress influences pore pressure and oil potential, thus has a great influence upon oil migration accumulation.
应变超孔隙水压力是上耦合于骨架剩余应变势的反映。
The strain excess pore water pressure is a response of the residual strain potential coupled with the skeleton of soil.
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